Several videos of andalusite in thin section, showing typical textures and optical characteristics. Supported by Boise State University and the US National Science Foundation.
Key characteristics: low/moderate relief, chiastolite cross, pink pleochroism (occasionally), very low interference colors.
00:00 Typical chiastolite
00:30 Elongate prism, tiny pink core (subtle)
01:01 Pink pleochroic core
01:32 Giant crystal (entire field of view), low/moderate relief
02:02 Another chiastolite
